ARM: imx_v6_v7_defconfig: Update ONBOARD_USB_HUB to ONBOAD_USB_DEV

The onboard_usb_hub driver has been updated to support non-hub devices,
which has led to some renaming.

Update to the new name (ONBOARD_USB_DEV) accordingly.

Based on similar fixes done by Javier Carrasco for other defconfigs.

Fixes: 0bb36055 ("ARM: imx_v6_v7_defconfig: Select CONFIG_USB_ONBOARD_HUB")
Signed-off-by: Fabio Estevam <festevam@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -336,7 +336,7 @@ CONFIG_USB_SERIAL_FTDI_SIO=m
 CONFIG_USB_SERIAL_OPTION=m
 CONFIG_USB_TEST=m
 CONFIG_USB_EHSET_TEST_FIXTURE=m
-CONFIG_USB_ONBOARD_HUB=y
+CONFIG_USB_ONBOARD_DEV=y
 CONFIG_NOP_USB_XCEIV=y
 CONFIG_USB_MXS_PHY=y
 CONFIG_USB_GADGET=y